| Project/Area Number |
18550050
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic chemistry
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| Research Institution | Utsunomiya University |
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Principal Investigator |
IMOTO Hideo Utsunomiya University, Faculty of Engineering, Professor (20168529)
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| Co-Investigator(Kenkyū-buntansha) |
SHAN Yue Jin Utsunomiya University, Faculty of Engineering, Associate Professor (20272221)
TEZUKA Keitaro Utsunomiya University, Faculty of Engineering, Assistant Professor (00334079)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥4,110,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥510,000)
Fiscal Year 2007: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2006: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | antimony / oxide / hollandite structure / lithium / ionic conduction / pyrochlore structure / tunnel structure / インジウム / ホランダイト型 / イオン伝導性 / Pブロック元素 |
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| Research Abstract |
Investigation of the network structures constructed with antimony and indium oxides led to the synthesis of a new compound LiIn_2SbO_6. We measured the X-ray and neutron powder diffraction data, and determined its crystal structure by Rietveld analysis. The structure had no disorder and the space of the Li site was not so large as expected. On the other hand, when larger alkali metals like potassium were used instead of lithium, antimony-indium oxide networks of the hollandite-type structure with larger tunnels were formed. Furthermore, the antimony-oxide network of the hollandite-type could include not only indium but also transition elements. We were interested also in the pyrochlore structures with large cavities, and investigated ASbWO_6 systems (A: alkaline elements). If sodium was used as the alkaline element, a new form of NaSbWO_6 was formed though the compounds with the cubic pyrochlore structure and an orthorhombic structure had been reported. The Rietveld analysis of the powder X-ray data of the new form showed that the structure was similar to the orthorhombic LiSbWO_6 but had a new monoclinic structure slightly deformed from the orthorhombic structure. When lithium was used as the alkaline element, an oxide with a pyrochlore-like structure was obtained, and the structure was different from the reported one. These experimental results indicated that the network structures with antimony oxide systems constructed by the synthetic reactions were not confined only in those that were thermodynamically most stable. Therefore, if we could find suitable synthetic procedures, we could build a wide range of network structures with antimony oxide systems.
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